<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>TEST</title>
    <script src="https://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
    <style>
        img {
            opacity: 0.3;
        }
        img:hover {
            opacity: 1;
        }
    </style>
</head>
<!-- /image/pay/pay.jpg -->
<body th:background="@{/image/error/404.jpg}" >
    <img th:src="@{/image/user/po.jpg}">
</body>
</html>